add vehicle_index_wishlist_row.xml;
update ButtonAction;
add VehicleAdapterWishlist;
implement VehicleAdapterWishlist on WishlistFragment;
add boolean and its getter and setter to store the status of the data;
add writeToJsonDB() method to VehicleAdapterWishlist;
implement writeToJsonDB() method on VehicleAdapterWishlist;
update onRefresh() and onPause() with codes to save data changes on the adapter to make sure that the data is updated in SharedPreferences;
add readFromJsonDB() method on WishlistFragment;
implement readFromJsonDB() method on WishlistFragment;